I highly recommend to calibrate the lenses for the best quality possible

I'm using the 6d and the quality is unbelievable.

Excellent build quality

After around 5 hours of work, the quality/ sharpness/ color contrast is far better on this Sigma than the Nikon 85 mm.in my opinion, this lens is better because it delivers a better or comparable quality at a lower price point

The build quality is fantastic, and the giant focusing ring is a pleasure to use for photos and videos

The quality of the material and the lens are ASTONISHING

The build quality is great, feels quite solid, but not as solid as the Otus (a subjective matter, mostly because the Otus feels like "cold metal", even the hood, this one feels more like a good quality polycarbonate :)I've read some folks complain about the size and weight of this lens

Or maybe the new Canon f/1.4 L lens rumored to come out this year?